/*
 * Copyright 2007 National Bioinformatics Network
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package dgbgui.gui.widgets.layouts;

import dgbgui.gui.widgets.WidthAdjustable;
import dgbgui.gui.widgets.visual.RectangleBorder;
import edu.umd.cs.piccolo.PNode;
import edu.umd.cs.piccolo.util.PBounds;

@SuppressWarnings("serial")
public class VerticalLayout extends Layout {
    
    public VerticalLayout(PNode parent, double margin, double spacing) {
        super(parent,margin,spacing);
    }

    public void layoutChildren() {
        double xOffset = m_margin;
        double yOffset = m_margin;
        
        // First reset the mininum widths of the child widgets
        for ( int index = 0; index < getChildrenCount(); ++index ) {
            PNode child = getChild(index);
            if ( child instanceof WidthAdjustable ) {
                ((WidthAdjustable)child).setAbsoluteWidth(0.0);
            }
        }
        
        // Determine the minimum width
        double maxWidth = 0;
        for ( int index = 0; index < getChildrenCount(); ++index ) {
            PNode child = getChild(index);
            PBounds childBounds = new PBounds();
            maxWidth = Math.max(maxWidth, child.computeFullBounds(childBounds).getWidth());
        }
        
        // Set the minimum width
        for ( int index = 0; index < getChildrenCount(); ++index ) {
            PNode child = getChild(index);
            if ( child instanceof RectangleBorder ) {
                ((WidthAdjustable)child).setAbsoluteWidth(maxWidth);
            }
        }

        // Actually do the vertical layout
        for ( int index = 0; index < getChildrenCount(); ++index ) {
            PNode child = getChild(index);
            child.setOffset(xOffset, yOffset  - child.getY());
            yOffset += child.getFullBounds().getHeight() + m_spacing;
        }
    }
    
}